3 Electrical Characteristics

The following table provides the absolute maximum specification conditions of the BM20/23 module.

Table 3-1. Absolute Maximum Specification
SymbolParameterMin.Max.Unit
BAT_INInput voltage for battery04.3V
ADAP_INInput voltage for adapter07.0V
TSTOREStorage temperature-65+150ºC
TOPERATIONOperation temperature-20+70ºC

The following table provides the recommended operating condition of the BM20/23 module.

Table 3-2. Recommended Operating Condition
SymbolParameterMin.TypicalMax.Unit
BAT_INInput voltage for battery33.74.2V
ADAP_INInput voltage for adapter4.555.5V
TOPERATIONOperation temperature-20+25+70ºC
Note: The absolute and recommended operating condition tables reflect typical usage for device.
CAUTION: Stresses listed under Absolute Maximum Ratings cause permanent damage to the device. This is a stress rating only. The functional operation of the device at those or any other conditions and those indicated in the operation listings of this specification, is not implied. Exposure to maximum rating conditions for extended periods affects the device reliability.

The parameters of the I/O and reset level are shown in the following table.

Table 3-3. I/O and Reset Level
ParameterMin.Typ.Max.Units
I/O supply voltage (VDD_IO)2.73.3V
I/O Voltage Levels
VIL input logic levels low‐0.30.8V
VIH input logic levels high2.03.6V
VOL output logic levels low0.4V
VOH output logic levels high2.4V
RESET
VTH,RES threshold voltage1.6V
Note:
  1. VDD_IO voltage is programmable by EEPROM parameters.
  2. These parameters are characterized but not tested in manufacturing.

The parameters of the battery charger are shown in the following table.

Table 3-4. Battery Charger
ParameterMinTypicalMaxUnit
ADAP_IN input voltage4.55.05.5V
Supply current to charger only34.5mA

Maximum battery

Fast charge current

Note: ENX2 = 0

Headroom > 0.7V

(ADAP_IN = 5V)
170200240mA

Headroom = 0.3V

(ADAP_IN = 4.5V)
160180240mA

Maximum battery

Fast charge current

Note: ENX2 = 1

Headroom > 0.7V

(ADAP_IN = 5V)
330350420mA

Headroom = 0.3V

(ADAP_IN = 4.5V)
180220270mA
Trickle charge voltage threshold3V

Battery charge termination current,

(% of fast charge current)
10%
Note:
  1. Headroom = VADAP_IN – VBAT
  2. ENX2 is not allowed to be enabled, when VADAP_IN – VBAT > 2V
  3. These parameters are characterized but not tested in manufacturing

The parameters of the LED driver are shown in the following table.

Table 3-5. LED driver
ParameterMinTypicalMaxUnit
Open-drain voltage3.6V
Programmable current range05.25mA
Intensity control16Step
Current step0.35mA
Power down open-drain current1μA
Shutdown current1μA
Note:
  1. Test condition: SAR_VDD = 1.8V, temperature = 25 ºC.
  2. These parameters are characterized but not tested in manufacturing.

The parameters of the audio Codec ADC are provided in the following table.

T = 25ºC, Vdd = 3.0V, 1 kHz sine wave input, Bandwidth = 20 Hz to 20 kHz.

Table 3-6. Audio Codec ADC
Parameter (Condition)Min.Typ.Max.Unit
Resolution16Bits
Output sample rate848kHz

Signal-to-Noise Ratio Note: 1

(SNR at MIC or Line-in mode)
88dB
Digital gain-544.85dB
Digital gain resolution2 to 6dB
MIC boost gain20dB
Analog gain60dB
Analog gain resolution2.0dB
Input full-scale at maximum gain (differential)4mV rms
Input full-scale at minimum gain (differential)800mV rms
3 dB bandwidth20kHz
Microphone mode (input impedance)24kOhm
THD+N (microphone input) at 30 mV/rms input0.02%
Note:
  1. fin = 1 kHz, B/W = 20 Hz to 20 kHz, A-weighted, THD+N < 1%, 150 mVpp input.
  2. These parameters are characterized but not tested in manufacturing.

The parameters of the audio Codec DAC are provided in the following table.

T = 25℃, Vdd = 3.0V, 1 kHz sine wave input, Bandwidth = 20 Hz to 20 kHz

Table 3-7. Audio Codec DAC
ParameterMin.Typ.Max.Unit
Over-sampling rate128fs
Resolution1620Bits
Output sample rate848kHz

Signal-to-Noise Ratio (Note: 1)

(SNR at Capless mode) for 48 kHz
96dB

Signal-to-Noise Ratio (Note: 1)

(SNR at Single-Ended mode) for 48 kHz
98dB
Digital gain-544.85dB
Digital gain resolution2 to 6dB
Analog gain-283dB
Analog gain resolution1dB
Output voltage full-scale swing (AVDD = 2.8V) (Note: 3)742.5mV/rms
Maximum output power (16 Ohm load)34.5mW
Maximum output power (32 Ohm load)17.2mW
Allowed load (Resistive)816O.C.Ω
Allowed load (Capacitive)500pF
THD+N (16 Ohm load)0.05%
Signal-to-Noise Ratio (SNR at 16 Ohm load)96dB
Note:
  1. fin = 1 kHz, B/W = 20 Hz to 20 kHz, A-weighted, THD+N < 0.01%, 0 dBFS signal, Load = 100 kOhm.
  2. These parameters are characterized but not tested in manufacturing.
  3. Vdd and AVDD are generated by internal LDO.

The parameters of the transmitter section for BDR and EDR are shown in the following table.

Test condition: VCC_RF = 1.28V, temperature = 25ºC.

Table 3-8. Transmitter section for BDR and EDR
ParameterMin.Typ.Max.Bluetooth specificationsUnit
Maximum RF transmit power (BM20-6 to 4dB
Maximum RF transmit power (BM23)2-6 to 4

EDR/BDR

Relative transmit power
-4-1.21-4 to 1dB
Note: The RF Transmit power is calibrated during production using MP Tool software and MT8852 Bluetooth Test equipment.

The parameters of the receiver section for BDR and EDR are shown in the following table.

Test condition: VCC_RF = 1.28V, temperature = 25ºC.

Table 3-9. Receiver Section for BDR and EDR
ParametersModulationMin.Typ.Max.Bluetooth SpecificationUnit
Sensitivity at 0.1% BERGFSK-90≤-70dBm
Sensitivity at 0.01% BERπ/4 DQPSK-91≤-70dBm
8DPSK-82≤-70dBm
Note: These parameters are characterized but not tested in manufacturing.

The parameters of system current consumption of analog audio output are shown in the following table.

Test condition: BAT_IN = 3.8V, link with HTC EYE cell phone; distance between cell phone and EVB is 30 cm.

Table 3-10. System Current Consumption of Analog Audio Output
System StatusTyp.Max.Unit
System off mode25µA
Standby mode0.8mA
Linked mode0.4mA
SCO link7.8mA
A2DP link (Vp-p = 200 mV; 1k tone signal)10.7mA
Note: Use BM20 EVB as a test platform.

The parameters of system current consumption of digital audio output are shown in the following table.

Test condition: BAT_IN = 3.8V, link with HTC M8 cell phone; distance between cell phone and EVB is 30 cm; I2S signal link with YAMAHA YDA174 EVB.

Table 3-11. System Current Consumption of Digital Audio Output
System statusTypMaxUnit
System Off mode25µA
Standby mode0.4mA
Linked mode0.4mA
SCO link9.3mA
A2DP link (1k tone signal)11.7mA
Note: Use BM23 EVB as a test platform.